package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;


@Slf4j
@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {


    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前加入到购物车中的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        //从表中查找
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list != null && !list.isEmpty()) {
            //如果已经存在了，只需要将数量加一
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);

        }else {
            //如果没有，新插入数据，需要判断是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                // 查出是菜品，从菜品表中取出菜品数据
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());

            }else {
                // 不然就是套餐，从套餐表中取出数据
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());

            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);

        }




    }


    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> shoeShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        return list;
    }


    /**
     * 清空购物车
     */
    @Override
    public void cleanShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }


    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list != null && !list.isEmpty()) {
            ShoppingCart cart = list.get(0);
            Integer number = cart.getNumber();
            if (number == 1) {
                shoppingCartMapper.deleteById(cart.getId());
            }else if (number >1) {
                cart.setNumber(number - 1);
                shoppingCartMapper.updateNumberById(cart);
            }
        }

    }


}
